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We give a detailed renormalization group analysis for the SU(16) grandunifiedgroup with general breaking chains in which quarks and leptons transformseparately at intermediate energies. Our analysis includes the effects of Higgsbosons. We show that the grandunification scale could be as low as $\sim10^{8.5}$ GeV and give examples where new physics could exist at relatively lowenergy ($\sim 250$ GeV). We consider proton decay in this model and show thatit is consistent with a low grandunification scale. We also discuss thepossible generation of a neutrino magnetic moment in the range of $10^{-11}$ to$10^{-10}\mu_B$ with a very small mass by the breaking of the embeddedSU(2)$_\nu$ symmetry at a low energy.Comment: (16 pages in REVTEX + 6 figures not included) OITS-49

SU(16) grand unification: Breaking scales, proton decay, and neutrino magnetic moment